隧道支护结构体系的刚度设计理论

doi:10.13722/j.cnki.jrme.2020.0822

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摘要隧道围岩变形是支护荷载的来源，也是诸多安全事故产生的根源，因此隧道工程设计应以围岩变形控制为核心。围岩变形本质上就是在不平衡力作用下围岩发生运动的结果，这是隧道围岩变形的根源，其变形量大小是围岩荷载与支护抗力博弈的结果，并且在围岩的不同变形阶段表现出较大的差异性；基于牛顿第二定律建立围岩变形的动力学分析概念模型，获得围岩变形演化特征方程，可对围岩变形过程进行预测和安全性评估；在给定的地层和工程条件下，由支护刚度所决定的抗力决定了围岩变形量，为此提出可以满足隧道围岩变形分布支护需求的支护刚度分布，由此形成以围岩变形控制为目标的支护刚度设计准则；针对支护系统刚度提升后所造成的支护结构荷载增大的事实，建立结构强度校核方法，可据此对支护刚度和变形控制目标进行调整，并构建了相应的支护刚度设计流程。基于上述基本理念，形成“围岩变形控制为目标，支护刚度设计为核心和强度校核作保障”的理论体系。最后，针对复杂隧道围岩大变形和严重超前破坏的特点，创建围岩与支护结构系统的协同控制理论与设计方法。

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	张顶立
	方黄城
	陈立平
	孙振宇

关键词 ：隧道工程；&ldquo, 支护&ndash, 围岩&rdquo, 关系；围岩变形机制；支护系统刚度；协同控制理论

Abstract：Surrounding rock deformation is the source of the supporting load and most tunnel accidents，so tunnel engineering design should focus on the deformation control. In general，the surrounding rock deformation is essentially caused by the unbalanced force，and its amount is the result of the interaction between the surrounding rock load and the supporting resistance. In this paper，a dynamic analysis model for surrounding rock deformation is established using Newton¢s second law and an explicit expression of surrounding rock deformation is thus obtained，which can be used to predict and evaluate the deformation process of the surrounding rock. Generally，the support stiffness determines the surrounding rock deformation under given stratum conditions. Therefore，the distribution of the support stiffness should be calculated according to the requirements of deformation control，which is the core content of the proposed support stiffness design theory. Since the internal force of the supporting structure increases with increasing the stiffness，a structural strength checking method is given to dynamically adjust the support stiffness and deformation control objectives. Based on the above basic principles，a theoretical system of “surrounding rock deformation control as the goal，support stiffness design as the core and strength checking as the guarantee” is formed. Finally，the collaborative control theory and design method of the surrounding rock-supporting structure system are given to overcome the difficulties of large deformation and serious advanced failure in complex tunnels.

Key words： tunnelling engineering')" href="#">

tunnelling engineering supporting structure-surrounding rock relationship surrounding rock deformation mechanism support system stiffness ')" href="#">cooperative control theory

引用本文:

张顶立，方黄城，陈立平，孙振宇. 隧道支护结构体系的刚度设计理论[J]. 岩石力学与工程学报, 2021, 40(4): 649-662.
ZHANG Dingli，FANG Huangcheng，CHEN Liping，SUN Zhenyu. Stiffness design theory for tunnel-support system. , 2021, 40(4): 649-662.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0822 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I4/649

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